# Relationship history for MSHA mine 3601836

Current hierarchy: **Randy C  Rothermel → Tracey & Partners → Tracey Slope**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Donaldson Coal Company → Tracey Slope; 1950-01-01 to 1976-12-26; source msha-controller-operator-history
- **controller_controls_mine:** Marlin  Wolfgang → Tracey Slope; 1950-01-01 to 1976-12-26; source msha-controller-operator-history
- **controller_controls_operator:** Marlin  Wolfgang → Donaldson Coal Company; 1950-01-01 to 1976-12-26; source msha-controller-operator-history
- **operator_operates_mine:** Tracey & Partners → Tracey Slope; 1976-12-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Randy C  Rothermel et al → Tracey Slope; 1976-12-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Randy C  Rothermel et al → Tracey & Partners; 1976-12-27 to current/open; source msha-controller-operator-history